The mayor has constantly sought to go around the union.
Last year, BATS sought to go public, listing shares on its own exchange.
The company sought to go public in 2006, but scrapped those plans.
Oaktree is one of several alternative investment firms that have sought to go public in recent years.
Newsweek has sought to go behind the scenes in Putin's court to find out about his personal habits and lifestyle.
Tellingly, a eulogist in The New Yorker sought to go beyond it by calling Jobs "the 20th century's Thomas Edison".
It is also, supposedly, the way we have ideally sought to go about our lives in America.
However, Mr Uribe at first sought to go further and impose fines of up to $13,000 for doctors who prescribe beyond what the list allows.
After emerging from bankruptcy, Safety-Kleen sought to go public in 2008, but had to scrap those plans because of the financial crisis.
Another recent approach sought to go around the problem by finding languages that had the most unusual features, skirting the question of whether those features were "hard".
When Go Daddy sought to go public in 2006, the company reported $139.8 million in revenue and conceded that it had consecutive annual losses.
